| 1 | // Copyright (C) 2021 Klarälvdalens Datakonsult AB, a KDAB Group company, info@kdab.com, author Marc Mutz <marc.mutz@kdab.com> |
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| 2 | // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only |
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| 3 | #ifndef Q20FUNCTIONAL_H |
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| 4 | #define Q20FUNCTIONAL_H |
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| 5 | |
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| 6 | #include <QtCore/qglobal.h> |
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| 7 | |
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| 8 | #include <functional> |
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| 9 | |
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| 10 | // |
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| 11 | // W A R N I N G |
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| 12 | // ------------- |
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| 13 | // |
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| 14 | // This file is not part of the Qt API. Types and functions defined in this |
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| 15 | // file can reliably be replaced by their std counterparts, once available. |
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| 16 | // You may use these definitions in your own code, but be aware that we |
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| 17 | // will remove them once Qt depends on the C++ version that supports |
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| 18 | // them in namespace std. There will be NO deprecation warning, the |
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| 19 | // definitions will JUST go away. |
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| 20 | // |
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| 21 | // If you can't agree to these terms, don't use these definitions! |
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| 22 | // |
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| 23 | // We mean it. |
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| 24 | // |
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| 25 | |
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| 26 | #include <functional> |
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| 27 | |
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| 28 | QT_BEGIN_NAMESPACE |
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| 29 | |
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| 30 | namespace q20 { |
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| 31 | // like std::identity |
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| 32 | #ifdef __cpp_lib_ranges |
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| 33 | using std::identity; |
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| 34 | #else |
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| 35 | struct identity |
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| 36 | { |
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| 37 | struct is_transparent {}; |
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| 38 | template <typename T> |
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| 39 | constexpr T &&operator()(T&& t) const noexcept { return std::forward<T>(t); } |
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| 40 | }; |
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| 41 | #endif // __cpp_lib_ranges |
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| 42 | } // namespace q20 |
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| 43 | |
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| 44 | QT_END_NAMESPACE |
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| 45 | |
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| 46 | #endif /* Q20FUNCTIONAL_H */ |
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| 47 | |
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